3(t+7)=12

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Solution for 3(t+7)=12 equation: 



3(t+7)=12

We move all terms to the left:

3(t+7)-(12)=0

We multiply parentheses

3t+21-12=0

We add all the numbers together, and all the variables

3t+9=0

We move all terms containing t to the left, all other terms to the right

3t=-9

t=-9/3

t=-3

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